Superheater steam boiler



Dec. 13, 1932. D. s. JAcoBu's I SUPERHEATER STEAM BOILER Original Filed June 17, 1924 m 4 W? W v INVENTOR M, ATTORNEY5 Fatented Dec. 13, 1932 UNITED STATES PATENT OFFICE DAVID S. JAGDBUS, F JERSEY CITY, NEW JERSEY, ASSIGNOR TO THE BABGOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY surnnnmrnn scream BOILER.

flriginal application filed June 17, 1924, Serial No. 720,502. Divided and this application died June 20,

1924, Serial No. 721,184.

My present invention relates tosuperheat- A or steam boilers, and particularly those in which a superheater is exposed to radiant heat, and will be best understood from the following description and the annexed drawing, in which Fig. 1 is a section of a well-known type of boiler having a superheater embodying an illustrative form of my invention; Fig. 2 is an enlarged portion of Fig. 1; Fig. 3 is a section on the 1ine'3- 3'of Fig. 2; Fig. 4 is a section on the line 4--4 of Fig. 2; Fig. 5 is a View similar to Fig. 2, but showing a modification, and Fig. 6 is a section on the line 66 of Fig. 5.

My present application is a division of my application Serial N 0. 720,502 which was filed in the Patent Ofiice on or about June 17, 1924.

Like reference characters indicate like parts in the several views.

1n the illustrative arrangement, the boiler has uptake headers 10 and downtake headers 11 connected in the usual. manner to a steam and water drum 12, the boiler tubes being arranged in two banks 13 and 14, with the tubes 14 extending across the furnace chamber 15 and the boiler being provided with baflies to direct the gases from the furnace chamber back and forth across the tubes to the gas outlet.

A primary superheater 16, provided with an inlet header 17 and an outlet header 18 is located in the Lsualposition above the boiler tubes 13, the inlet header 17 being connected by the pipe 19 to a pipe 20 connected to the steam and water drum 12.

In the illustrative arrangement, a radiant heat su'perheater is suspended from the lowermost row of the tubes1'4 directly above the furnace chamber 15, this -superheater comprising tubes 21 connected to an inlet header 22 and an outlet header 23, each located on opposite sides of the boiler with the superheater tubes 21 extending parallel to the boiler tubes. As many of the superheater tubes 21 as desired may be supplied in the form illustrated up to the number. of tubes 14 of the bottommost row. The superheater tubes 21 arearranged so as to have thermal contact with the boiler tubes to protect the Renewed April 8, 1932.

superheater tubes from excessive heating,

particularly if for any reason, the heat conditionsbecome such that the superheater tubes tend to become overheated. As one form of accomplishingthis, I have provided the tubes 14' in the lowermost row with pro- Y jections 24, spaced along the tubes 14 and provided with a curved recess into which the superheater tube 21 fits snugly, so as to make a close contact between the superheater tube and the projection 24. Obviously, the length and number of'the projections 24 may be anything desired, according to the amount of heat around the water tube 14, these loops being arranged so as to hold the superheater tube 21 snugly against the projection 24. Preferably, also, the loops 25 are arranged so that if for any reason there is relative longitudinal movement between the water tubes 14 and the superheater tubes 21, due to dflerent heat conditions in the two tubes, the loops 25 will permit this relatve longitudinal movement with out injury to either of the tubes.

In the modification shown in Figs. 5 and 6, the superheater tube 21 is held in position against the projections 24 by straps 26 extending around the two tubes, these straps functioning as will be obvious in the same manner as the loops 25, but being unconnect ed to either of the tubes.

It will be obvious that the means for forming a thermal contact between the super heater tubes and the water tubes may be widely var'ed and that the particular form which I have shown is merely illustrative and that the same applies to the means by which the two tubes may be held in thermal contact.

A pipe 27 extends from the outlet header header 220i the radiant heat superheater and a by-pass pipe 28 connects the pipe 20 with the pipe 27 at a po nt between the {outlet header 18 and the inlet header 22. By this 18 of the primary superheater 16 to the inlet arrangement, saturated steam from the drum 12 may be directed through the pipes 20 and 19 to the primary superheater l6 and from thence through the pipe 27 to the radiant heat superheater tubes 21. Throu h the bypass pipe 28 saturated steam may be diverted around the primary superheater l6 and thus directly to the radiant heat superheater tubes 21. valve 29 in the pipe 20 may be provided to regulate the amount of saturated steam passing through the pipes 19 and 28.

.While I have shown my invention in connection with a boiler having horizontally inclined water tubes, it will be obvious that it may be applied to any other form of boiler, and that the embodiment thereof may be widely varied.

I claim:

1. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, and a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and means to support each su erheater tube from one of said boiler tu as and hold said superheated tube and said boiler tube in close thermal contact.

2. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and means to support each superheater tube from one of said boiler tubes and hold said superheater tube and said boiler tube in close thermal contact, said means being arranged to permitrelative longitudinal motion between said tubes.

3. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and a plurality of loops for each superheater tube extendin around a water tube and arranged to hol said tubes in close thermal contact.

4. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed ot the radiant heat, and a plurality of loops for each su erheater tube extending around a water tu e and arranged to hold said tubes in close thermal contact, and permit relative longitudinal motion therebetween.

5. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and means to support each superheater tube from one of said boiler tubes and hold said superheater tube and said boilor tube in close thermal contact, the exterior of each superheater tube and the corresponding boiler tube being shaped to provide a relatively large area of thermal contact between said tubes.

6. In a steam boiler, a bank of superheater tubes with at least a portion of each tube exposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and means to sup ort each superheater tube from one of said boiler tubes and hold said superheater tube and said boiler tube in closethermal contact, the exterior of each superheater tube and the corresponding boiler tube being provided with contactposed to radiant heat from the furnace, a row of boiler tubes parallel and adjacent the portions of the superheater tubes exposed to the radiant heat, and means to support each superheater tube from one of said boiler tubes and hold said superheater tube and said boiler tube in close thermal contact, the exterior of each superheater tube and the corresponding. tube being provided with contacting portions spaced along the tubes and shaped to provide a relatively large area of thermal contact between said tubes.

8. A steam boiler having horizontally ex: tending water tubes above a furnace chamber, a superheater havingtubes beneath the lowermost rows of boiler tubes and exposed to the radiant heat'of the furnace and in thermal contact with the boiler tubes, said superheater tubes being parallel to the boiler tubes and each suspended from a boiler tube.

9. A steam boiler having horizontall extending water tubes above a furnace 0 amber, a superheater having tubes beneath the lowermost rows of boiler tubes and exposed to the radiant heat of the furnace and in thermal contact with the boiler tubes, said superheater tubes being arallel to the boiler tubes and suspension evices between each superheater tube and a boiler tube arranged to permit relative longitudinal movement between said tubes. 4

10. In combination, a furnace chamber, a superheater tube so placed as to be exposed to radiant heat from said chamber, a boiler tube disposed at least in part behind said superheater tube so as to be shielded thereby from the radiant heat of the chamber, and means for holding said tubes in close thermal contact with each other.

11. In combination, a furnace chamber, a superheater tube so placed as tobe ex osed to radiant heat from said chamber, a oiler tube disposed at least in part behind said superheater tube so as to be shieldedthereny till from the radiant heat of the chamber, and means for holding said tubes in close thermal contact with each other and parallel to each other, said means being arranged to permit relative longitudinal motion between said tubes.

12. In combination, a furnace chamber, a superheater tube so placed as to be exposed to radiant heat/from said chamber, a boiler 1 tube disposed at least in part behind said superheater tube so as to be shielded thereby from the radiant heat of the chamber, and means carried by said Water tube for holding said superheater tube in close thermal contact therewith.

13. In combination, a furnace chamber, a superheater tube so placed as to be exposed to radiant heat from said chamber, a boiler tube disposed at least in part behind said superheater tube so as to be shielded thereby from the radiant heat of the chamber, and means carried by said water tube for holding said superheater tube in close thermal contact therewith and parallel thereto, said means being arranged to permit relative longitudinal motion between said tubes.

14. In combination, a furnace chamber, a superheater tube so placed as to be exposed at least in part to radiant heat from said chamber, a boiler tube disposed adjacent said superheater tube and parallel thereto, and means for holding said tubes in close thermal contact with each other, said means being arranged to permit relative longitudinol motion between said tubes.

15. In combination, a. furnace chamber, a superheater tube so placed as to be exposed at least in part to radiant heat from said chamber, a boiler tube disposed adjacent said superheater tube, and means for holding said tubes in extended thermal contact with each other.

16. A water tube steam boiler comprising a furnace chamber, a steam superheater tube having a substantial portion exposed to radiant heat'from said furnace chamber, and a water tube arranged substantially in parallel and in extended intimate thermal contact with said superheater tube.

as DAVID S. J ACOBUS. 

